tvOS 13 now supports picture-in-picture mode, and it works well in the official Apple TV app - the video player has a specific PiP button.
I thought that this PiP button would be present by default in all applications that use the native player. But this is not at all. Perhaps that the developer must apply this support PiP in his application. But I did not find documentation on how to do implement.
Has anyone already faced this problem?